Toy staircase



FIG. 1 is a top perspective view of a toy staircase showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a side elevational view thereof, the opposite side being a mirror image. 

The ornamental design for a toy staircase, as shown and described. 